726636225 has 24 divisors (see below), whose sum is σ = 1372997440. Its totient is φ = 332176320.

The previous prime is 726636221. The next prime is 726636227. The reversal of 726636225 is 522636627.

It is a happy number.

It is not a de Polignac number, because 726636225 - 2² = 726636221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (726636221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 691510 + ... + 692559.

Almost surely, 2^726636225 is an apocalyptic number.

726636225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

726636225 is a deficient number, since it is larger than the sum of its proper divisors (646361215).

726636225 is a wasteful number, since it uses less digits than its factorization.

726636225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384089 (or 1384084 counting only the distinct ones).

The product of its digits is 181440, while the sum is 39.

The square root of 726636225 is about 26956.1908473731. The cubic root of 726636225 is about 899.0261998144.

The spelling of 726636225 in words is "seven hundred twenty-six million, six hundred thirty-six thousand, two hundred twenty-five".